National Geographic cameraman Bob Poole was filming elephants in Mali, West Africa, when something quite unusual happened: a giant dust storm rose up and swallowed all the light, turning day into pitch darkness. Naturally, he kept on filming!
Hit play or go to http://channel.nationalgeographic.com/series/great-migrations-episode-guide/#tab-Videos/08740_00 - Thanks Minjae!
No wonder people and animals get desorientated and get lost and even die in that.
If I saw that I would assume it was some sort of freakish Armageddon event.